I've been testing out the Firefox 4.0 Beta, and have noticed that the links a long the top of the page next to "View Cart" no longer show up. They appear just fine in 3.6.13 however.
I took a couple screen shots to show the issue. The first is with 4.0, and the second with 3.6.13.
Not sure if this is related to the site, or 4.0 being in beta, but I thought I'd bring it up anyway.